Liquid pumps



Nov. 4, 1969 v R. 'r. J. SKINNER 3,476,051

LIQUID PUMPS Filed Dec. 19, 1967 ATTORNEYS United States Patent US. Cl.103-5 3 Claims ABSTRACT OF THE DISCLOSURE A liquid pump comprises a bodyhaving a pumping cavlty containing a rotor, the cavity having at leastone outlet and, in an inlet plate, at least one inlet port disposed ator near the rotor periphery, the opposite side of the rotor having achannel formed by an annular piston.

This invention relates to liquid pumps of the kind comprising a bodyhaving a cavity in which is disposed a bladed rotor, the cavity havingan inlet and an outlet.

The object of the invention is to provide a liquid pump of the kindreferred to in a convenient form.

In accordance with the present invention a liquid pump comprises a body,having a pumping cavity and at least one outlet therefrom, a bladedrotor mounted within the cavity, an inlet plate at least in part formingone side wall of the cavity, at least one inlet port in the inlet plate,said inlet port being disposed at or near the periphery of the rotor,the opposite side wall of the cavity having means for defining a channelin the side of the cavity adjacent to the rotor periphery and extendingbetween the position of said inlet and that of said outlet.

The invention will now be described by way of example with reference tothe accompanying drawing in which;

FIGURE 1 illustrates, in cross-section, a pump constructed in accordancewith the invention, and

FIGURE 2 is a developed part section, on the rotor circumference.

The pump comprises a body in which is defined a substantiallycylindrical cavity 11 containing a bladed rotor 12, there being, in thewall of the cavity 11, a pair of tangentially disposed outlets 13 (onlyone being shown).

The rotor 12 is mounted upon a shaft 14 arranged to be driven byassociated apparatus such as an engine to which the pump is intended tosupply fuel, there being a bearing structure indicated generally at 15for supporting the shaft 14 in the body 10.

Adjacent to one side of the rotor 12 and at least in part forming oneside wall of the cavity, is an inlet plate 16 secured in the body 10,this inlet plate having a pair of inclined and tapering passages 17communicating with the pumping cavity 11 through ports 18. The ports 18are disposed at or near the periphery of the rotor 12 as illusstrated.The passages 17 are supplied with liquid to be pumped from an inlet 19formed in a part 20 secured by bolts 21 to the body 10. Flow of liquidfrom the inlet 19 to the passage 17 in the inlet plate 16 takes placethrough a further bladed rotor 22 which is also mounted upon the shaft14 for rotation with the rotor 12. The rotor 22 serves as a primary pumpand this is a substantially conventional form of centrifugal pump, theinlet thereto being near the centre 'of rotation directly from the inlet19, and delivery therefrom being at the outer periphery of the rotor 22to the passages 17 in the inlet plate 16.

At the opposite side of the rotor 12 from the inlet plate 16 is providedan annular piston 23 which is movable axially with respect to the rotor12, the crown of the piston 23 defining the base of an annular channel24 divided into two portions by a pair of fixed abutments 25. The piston23 is spring loaded away from the rotor by springs 3,476,051 PatentedNov. 4, 1969 mounted within the abutments 25, as seen in both figures ofthe drawings.

The piston 23 is however adjustable so as to define a greater or lesserdepth of side channel 24. The two portions of the channel extendrespectively between the position of an inlet port 18 and that of theassociated outlet 13. In an alternative form, however, only one inletport 18 and outlet 13 are provided, and one abutment 25. In this formthe inlet port and outlet are at opposite sides of the abutmentrespectively.

Having thus described my invention what I claim as new ice and desire tosecure by Letters Patent is:

, the cylindrical wall thereof, a bladed rotor mounted within thecavity, an inlet plate forming at least part of one side wall of thecavity, at least one inlet port in the inlet plate, said inlet portbeing disposed near the rotor periphery and spaced circumferentiallyfrom the outlet, an inlet in the body with which the inlet portcommunicates, a channel in the side of the cavity remote from the inletplate, said channel being disposed adjacent to the rotor periphery andextending between the position of the inlet and that of the outletaround the cavity, abutment means defining the ends of the channel, apiston mounted in the body to form the base wall of the channel, andmeans resiliently supporting the piston whereby the piston is movabletowards and away from the rotor to vary the volume of the channel on theoperation of the pump.

2. A liquid pump comprising a body, a generally cylindrical pumpingcavity defined within the body, two outlets in the body communicatingwith said cavity through the cylindrical wall thereof at spacedpositions, a bladed rotor mounted within the cavity, an inlet plateforming at least part of one side wall of the cavity, two inlet ports inthe inlet plate, said inlet ports being disposed near the rotorperiphery and spaced circumferentially from the outlets respectively, aninlet in the body with which the inlet ports communicate, two channelsin the side of the cavity remote from the inlet plate, said channelsbeing disposed adjacent to the rotor periphery and extendingrespectively between the position of an inlet and that of an outletaround the cavity, a pair of abutments defining the ends of the channelsrespectively, an annular piston mounted in the body to form the basewalls of the two channels, and means resiliently supporting the pistonwhereby the piston is movable towards and away from the rotor to varythe volumes of the channels on the operation of the pump.

3. A liquid pump as claimed in claim 1 in which the body has a furtherchamber between the inlet plate and the inlet in the body, and a primarycentrifugal type pump impeller rotatably mounted in said furtherchamber, and a drive shaft connected to said impeller and to the rotorof the pump.

References Cited UNITED STATES PATENTS 916,427 3/ 1909 Fee 103-971,979,621 11/1934 Hollander 103-96 2,073,014 3/1937 Jennings 103-962,875,698 3/1959 Roth 103-105 3,002,463 10/ 1961 Lahti 103-96 3,252,4215/1966 Luhmann 103-96 FOREIGN PATENTS 871,494 3/ 1953 Germany.

HENRY F. RADUAZO, Primary Examiner US. Cl. X.R. 103-2, 96, 97, 105

